I have ran bilstiens, kybs, ranchos and emus. They are all good quality shocks, but here are my impressions:
Bilstiens are great if you want a firm spritly ride that's a little stiff. Expect to air way down for comfort on the trail.
KYBs are almost as firm as Bilstiens, with a very good fire roading ride, but a bit more comfortable. They look kind of spindly, but I actually liked them better than the bilstiens.
Ranchos are a good all around shock. I am running the adjustables on my current trail rig. I kind of like adjustables since you can tune your ride, but I don't think you need them if you can get the right valving in the first place...
Which leaves us to the Old Man Emus: I had them on a '95 4runner with 33s, emu springs and downey torsion bars. These things are awesome! Valved per application and spring rate. Absolutley the best shocks I've ever had! Total dead butt stuck to the road suspension feel. They look a little boring with no boots and just a metal dust cover (kind of look like a monroe) but I think the design is better for keeping the shaft from rock chip damage. The only draw back is that they are only available for very conservative stockish 1-2 inch lift ride height and they are best when ran with emu springs, which cost alot.
If you are running stock or low lift, get the Emus.
One shock I want to try on a build is the black shocks with the rooster on them from Poly Performance. Don't know the brand but I think they are valved correctly and can be bought in really lond lengths.
Good Luck!